Electrons in Atoms. Before You Read. Chapter 4. Review the structure of the atom by completing the following table.
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1 Electrons in Atoms Before You Read Chapter 4 Review the structure of the atom by completing the following table. Part of the Atom Description proton centrally located part of the atom that contains protons and neutrons electron subatomic particle with no charge found in the Draw a typical atom and label the structures. Identify three facts about electrons. Example: Electrons are a part of the structure of an atom
2 Electrons in Atoms Section 1 Light and Quantized Energy Scan Section 1 of your text. Use the checklist below as a guide. Read all section titles. Read all boldfaced words. Read all tables and graphs. Look at all pictures and read the captions. Write three facts you discovered about light Use your text to define each term. electromagnetic radiation wavelength frequency amplitude electromagnetic spectrum quantum Planck s constant photoelectric effect _ photon atomic emission spectrum 58
3 The Atom and Unanswered Questions Use with pages 136. List the three reasons scientists found Rutherford s nuclear atomic model to be fundamentally incomplete. 3. Wave Nature of Light Explain the relationship shown by the figure below. Use the following terms: wavelength, frequency, amplitude, and speed. Use with pages
4 Calculating Wavelength of an EM Wave Use with Example Problem 1, page 140. Solve Read Example Problem 1 in your text. You Try It Problem Radio waves are used to transmit information on various channels. What is the wavelength of a radio wave having the frequency of Hz? 1. Analyze the Problem Known: v = and c = UnKnown: = You know that because radio waves are part of the electromagnetic spectrum, their speed, frequency, and wavelength are related by the formula c v. 2. Solve for the Problem Solve the equation relating the speed, frequency, and wavelength of an electromagnetic wave for wavelength ( ). If c v, then Substitute c and the frequency of the radio wave, v, into the equation. Note that hertz is equivalent to 1/s or s 1. Divide the values to determine wavelength, and cancel units as required. 3. Evaluate the Answer The answer is correctly expressed in a unit of. Both of the known values in the problem are expressed with significant figures, so the answer must have significant figures. 60
5 Particle Nature of Light Use with pages Identify two facts the wave model of light failed to explain. Describe Planck s quantum concept by completing the following statement. The quantum concept concludes that matter can gain or lose only in small, specific amounts called. A quantum is the minimum amount of energy that can be or by an atom. Atomic Emission Spectra Use with pages Compare and contrast Einstein s equation with Planck s equation by completing the following sentence. Planck s equation,, demonstrates mathematically that the energy of a quantum is related to the of the emitted radiation. Einstein went further by explaining that, in addition to its wavelike characteristics, a beam of light can be thought of as a stream of called. Contrast the continuous electromagnetic spectra and the atomic emission spectra. 61
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